By hardest and easiest, I mean by recruitment rate. Excluding you, your starter, and 100% rate Pokemon, which Pokemon have the highest recruitment rate? For hardest, it is lowest recruitment rate. However, if multiple Pokemon have a low recruitment rate and a special condition (for example, Kecleon in Explorers of Time/Darkness), then that is the Pokemon. If there are multiple Pokemon for both categories, include them. I want to know this for all games excluding DX.